Warm up 10/211. Turn in your signed lab safety sheet. 2. What is an atom? An element? The periodic

table? If you can’t remember dig waaaay back into your brain and try to make a really close guess.

3. What do you think the four macromolecules are that are listed on the state standard?

Unit 3 Chemistry of Life

Matter is made up of atoms.

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+

–

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Proton (positive charge)

Neutron (neutral)

Electron (negative charge)

atom nucleus

Human Demonstration

• Orange = proton– In nucleus, move very slightly

• Yellow = neutron– In nucleus, move very slightly

• Green = electron– Revolve around outside of

atom, move a lot. ++

+

–

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http://www.dapperstache.com/index.php?contenttype=ptoa&title=ptoa

Molecule• Compound in which the atoms

are held together by covalent bonds (when electrons are shared).

Compound• A pure substance formed when two or more

different elements combine. Each has a chemical formula from the periodic table.

• EX: H2O, NaCl, CH4

• Can be broken down by chemical means.

Exit Ticket

• Use your notes. Explain to me how protons, neutrons, electrons, atoms, molecules, and compounds are related to one another. Use complete sentences and the connecting words we talked about.

Warm Up 10/24Copy the folowing into your notes for today:• Chemical Reaction: Process by which atoms or

groups of atoms in substances are reorganized into different substances. – Chemical bonds are broken and/or formed.

• Chemical equation:

Chemical Reaction (rxn)

• Process by which atoms or groups of atoms in substances are reorganized into different substances. – Chemical bonds are broken and/or formed.

Chemical equations

Activation Energy--minimum amt. of energy needed for reactants to form products in a chemical reaction.

Catalyst—substance that lowers the activation energy needed to start a chemical reaction.Enzyme—special protein that speeds up the rate of a chemical reaction.

How an Enzyme works.

• Substrate—reactants that bind to the enzyme.• Active site—specific location where a

substrate binds on an enzyme.• Product—result; what you end up with.

Warm-up 10/26

• Write this down: “All compounds are molecules but not all molecules are compounds.” Explain why this is true.Molecules are two or more atoms. Compounds are two or more DIFFERENT atoms.

Macromolecules

• Large molecules that are formed by joining smaller organic (containing C) molecules together.

Carbohydrates

• CH2O• Monosaccharides – glucose, fructose, galactose

• Disaccharides– Sucrose, lactose

• Polysaccharides– Starch, glycogen, cellulose

• Store energy• Provide structural support

Lipids

• Fats, oils, waxes• Store energy• Phospholipids– Allows cells to let some things in and not others.– Do not dissolve in water.

Proteins

• Made up of amino acids• Transport substances• Structural support• Make hormones

Nucleic Acids• Store and transmit genetic information.• Made up of repeating subunits called nucleotides• DNA, RNA, ATP

Warm up 10/281. What is the name of the protein that speeds up

chemical reactions? Catalyst

2. A chemical reaction takes place during which the molecules of a toothpick are broken down, but without any assistance of the protein mentioned in #1. How would the graph showing this reaction look different than the one you made for the toothpickase lab? The curve would extend slightly higher, showing that the reaction used more energy.

pH• The measure of the concentration of H+ in a

solution.• pH of pure water = 7• Acid: pH lower than 7• Base: pH higher than 7